关键词: 冷轧, 多阶段, 多流向, 生产计划, 改进遗传算法

Abstract: Aiming at the characteristics of multi-stage inventory and multi-flow directions in cold rolling production process,based on meeting the process constraints,a multi-stage inventory and multi-flow directions production planning model was established,which took undue or overdue contracts,sufficient or insufficient intermediate inventory and minimum inventory costs of finished products as the objectives.The model was solved by an improved genetic algorithm.Through setting reasonable parameters,the occurrences where crossover probability and mutation probability took fixed values within a certain range and the function values appeared big jumps at some breakpoints or unreasonable value were avoided.These two probabilities could be adjusted adaptively by the fitness of individuals.A case study was presented to verify the effectiveness of the model and algorithm,and the result showed that the presented model could guarantee due dates of contracts and reduce inventory costs.

Key words: cold rolling, multi-stage, multi-flow directions, production planning, improved genetic algorithm